Hydrothermal upgrading of biomass: effect of K2CO3 concentration and biomass/water ratio on products distribution.

Catalytic hydrothermal treatment of wood biomass was performed at 280 degrees C for 15 min in the presence of K2CO3 with different concentrations and biomass/water ratio (thermal). Oil products were extracted from both liquid and solid portion by different solvents and analyzed them individually. The biomass to water ratio has an important effect on product distribution and composition of oil products. Oil 1 (ether extract) with K2CO3 contained mainly phenolic compounds. Benzenediol derivatives were observed with 0.94 M K2CO3 concentration and they were not formed at lower concentrations (0.235 and 0.47 M). The decrease of solid residue was achieved to 4% with 0.94 M K2CO3 at 280 degrees C for 15 min. The volatility distribution of hydrocarbons (ether extract) were characterized by using C-NP gram. The distribution of oxygenated hydrocarbons changed depending upon the biomass to water ratio and concentration of K2CO3 solution.

[1]  S. Rezzoug,et al.  Liquefaction of wood in two successive steps: solvolysis in ethylene-glycol and catalytic hydrotreatment , 2002 .

[2]  Kunio Arai,et al.  Conversion of Lignin with Supercritical Water−Phenol Mixtures , 2003 .

[3]  T. Ogi,et al.  Decomposition of Cellulose and Glucose in Hot-Compressed Water under Catalyst-Free Conditions , 1998 .

[4]  Yusaku Sakata,et al.  Basic study on a continuous flow reactor for thermal degradation of polymers , 2002 .

[5]  Fang Zhen,et al.  Liquefaction of cellulose in hot compressed water using sodium carbonate: Products distribution at different reaction temperatures , 1997 .

[6]  T. Bhaskar,et al.  Low-Temperature Hydrothermal Treatment of Biomass: Effect of Reaction Parameters on Products and Boiling Point Distributions , 2004 .

[7]  T. Bhaskar,et al.  Effect of Rb and Cs carbonates for production of phenols from liquefaction of wood biomass , 2004 .

[8]  Thomas Maschmeyer,et al.  Hydrothermal upgrading of biomass to biofuel; studies on some monosaccharide model compounds. , 2004, Carbohydrate research.

[9]  T. Ogi,et al.  Direct Liquefaction of Wood by Catalyst (Part 1) , 1985 .

[10]  A. Kruse,et al.  Key Compounds of the Hydropyrolysis of Glucose in Supercritical Water in the Presence of K2CO3 , 2003 .

[11]  Yong-jie Yan,et al.  Liquefaction of sawdust for liquid fuel , 1999 .

[12]  N. Hayashi,et al.  Decomposition of Cellulose in Near-Critical Water and Fermentability of the Products , 1996 .

[13]  T. Bhaskar,et al.  Utilization of waste biomass and replacement of stoichiometric reagents for the synthesis of nanocrystalline CeO2, ZrO2 and CeO2–ZrO2 , 2003 .

[14]  Fang Zhen,et al.  Cellulose decomposition in hot-compressed water with alkali or nickel catalyst , 1998 .